Reivindicación 1: Una composición herbicida que comprende una cantidad sinérgicamente eficaz como herbicida de (a) (±)-2-exo-(2-metilbenciloxi)-1-metil-4-isopropil-7-oxabiciclo[2.2.1]heptano, cualquiera de sus enantiómeros individuales o cualquier mezcla no racémica de estos (herbicida A) y (b) al menos un inhibidor de protoporfirinógeno oxidasa (inhibidor de PPO) seleccionado de flumioxazin (B.1) y sulfentrazone (B.2) (herbicida B). Reivindicación 5: La composición de acuerdo con cualquiera de las reivindicaciones 1 a 4, que también comprende al menos un herbicida C seleccionado del grupo que consiste en acetochlor (C.1), aclonifen (C.2), amicarbazone (C.3), amidosulfuron (C.4), aminopyralid (C.5), amitrole (C.6), asulam (C.7), atrazine (C.8), azimsulfuron (C.9), beflubutamid (C.10), benfluralin (C.11), bensulfuron (C.12), bensulide (C.13), bentazone (C.14), bicyclopyrone (C.15), bifenox (C.16), bispyribac (C.17), bromoxynil (C.18), carbetamide (C.19), carfentrazone (C.20), chloridazon (C.21), chlorpropham (C.22), chlorsulfuron (C.23), chlorthal (C.24), chlortoluron (C.25), clethodim (C.26), clodinafop (C.27), clomazone (C.28), clopyralid (C.29), cycloxydim (C.30), cyclopyrimorate (C.31), cyhalofop (C.32), 2,4-D (C.33), dazomet (C.34), 2,4-DB (C.35), desmedipham (C.36), dicamba (C.37), dichlorprop (C.38), dichlorprop-P (C.39), diclofop (C.40), diflufenican (C.41), -diflufenzopyr (C.42), dimethachlor (C.43), dimethenamid (C.44), dimethenamid-P (C.45), diquat (C.46), dithiopyr (C.47), diuron (C.48), ethametsulfuron (C.49), ethofumesate (C.50), fenoxaprop (C.51), fenoxaprop-P (C.52), fenquinotrione (C.53), flazasulfuron (C.54), florasulam (C.55), fluazifop (C.56), fluazifop-P (C.57), flucarbazone (C.58), flufenacet (C.59), fluometuron (C.60), flupyrsulfuron (C.61), flurochloridone (C.62), fluroxypyr (C.63), flurtamone (C.64), foramsulfuron. (C.65), glufosinato (C.66), glufosinato-P (C.67), glifosato (C.68), halauxifen (C.69), halosulfuron (C.70), haloxyfop-P (C.71), indaziflam (C.72), imazamox (C.73), imazaquin (C.74), imazethapyr (C.75), imazosulfuron (C.76), iodosulfuron (C.77), iofensulfuron (C.78), ioxynil (C.79), isoproturon (C.80), isoxaben (C.81), isoxaflutole (C.82), lenacil (C.83), linuron (C.84), MCPA (C.85), MCPB (C.86), mecoprop (C.87), mecoprop-P (C.88), mesosulfuron (C.89), mesotrione (C.90), metam (C.91), metamitron (C.92), metazachlor (C.93), methiozoline (C.94), metobromuron (C.95), metolachlor (C.96), S-metolachlor (C.97), metosulam (C.98), metribuzin (C.99), metsulfuron (C.100), molinate (C.101), metil arseniato monosódico) (MSMA) (C.102), napropamide (C.103), napropamide-M (C.104), nicosulfuron (C.105), orthosulfamuron (C.106), oryzalin (C.107), oxadiargyl (C.108), oxadiazon (C.109), oxasulfuron (C.110), oxyfluorfen (C.111), pendimethalin (C.112), penoxsulam (C.113), pethoxamid (C.114), phenmedipham (C.115), picloram (C.116), picolinafen (C.117), pinoxaden (C.118), pretilachlor (C.119), prodiamine (C.120), profoxydim (C.121), prometryne (C.122), propaquizafop (C.123), propoxycarbazone (C.124), propyzamide (C.125), prosulfocarb (C.126), prosulfuron (C.127), pyraflufen (C.128), pyridate (C.129), pyroxasulfone (C.130), pyroxsulam (C.131), quinclorac (C.132), quinmerac (C.133), quinoclamine (C.134), quizalofop (C.135), quizalofop-P (C.136), rimsulfuron (C.137), saflufenacil (C.138), sethoxydim (C.139), siduron (C.140), simazine (C.141), sulcotrione (C.142), sulfosulfuron (C.143), tembotrione (C.144), tepraloxydim (C.145), terbuthylazine (C.146), thiencarbazone (C.147), thifensulfuron (C.148), tolpyralate (C.149), topramezone (C.150), tralkoxydim (C.151), tri-allate (C.152), triasulfuron (C.153), tribenuron (C.154), triclopyr (C.155), trifloxysulfuron (C.156), trifludimoxazin (C.157), trifluralin (C.158), triflusulfuron (C.159), tritosulfuron (C.160), ácido 4-amino-3-cloro-6-(4-cloro-2-fluoro-3-metoxifenil)-5-fluoropiridin-2-carboxílico (C.161), bencil 4-amino-3-cloro-6-(4-cloro-2-fluoro-3-metoxifenil)-5-fluoropiridin-2-carboxilato (CAS 1390661-72-9, C.162), imazapyr (C.163), y sus sales, ésteres o amidas aceptables en la agricultura. Reivindicación 6: La composición de acuerdo con cualquiera de las reivindicaciones 1 a 5, que también comprende al menos un protector D seleccionado del grupo que consiste en benoxacor (D.1), cloquintocet (D.2), cyometrinil (D.3), cyprosulfamide (D.4), dichlormid (D.5), dicyclonon (D.6), dietholate (D.7), fenchlorazole (D.8), fenclorim (D.9), flurazole (D.10), fluxofenim (D.11), furilazole (D.12), isoxadifen (D.13), mefenpyr (D.14), mephenate (D.15), ácido naftalenacético (D.16), anhídrido naftálico (D.17), oxabetrinil (D.18), 4-(dicloroacetil)-1-oxa-4-azaspiro[4.5]decano (MON4660, CAS 71526-07-3) (D.19), 2,2,5-trimetil-3-(dicloroacetil)-1,3-oxazolidina (R-29148, CAS 52836-31-4) (D.20), N-(2-metoxibenzoil)-4-[(metilaminocarbonil)amino]bencensulfonamida (CAS 129531-12-0) (D.21) y sus sales, ésteres o amidas aceptables en la agricultura. Reivindicación 7: La composición de acuerdo con cualquiera de las reivindicaciones 1 a 6, que también comprende uno o más auxiliares habituales en la protección de cultivos. Reivindicación 8: El uso de la composición de acuerdo con cualquiera de las reivindicaciones 1 a 7 para controlar la vegetación no deseada. Reivindicación 9: Un método para controlar vegetación no deseada que comprende aplicar a la vegetación o a su locus o aplicar al suelo o al agua, para prevenir el surgimiento o crecimiento de la vegetación no deseada, la composición de acuerdo con cualquiera de las reivindicaciones 1 a 7.